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Best answer

Let's check. You need to have:

Gotten the National Pokedex

Beaten the Elite Four

>I think I got it.
Go into the Celestic Ruins and inspect the drawings at the end of it.
commented 1 minute ago by Mew :3
After that, talk to the Grandmother, then check Spear Pillar.
commented 2 seconds ago by Mew :3